added Jarmo Pretman's expand-aliases plugin

plugins/expand_aliases/README.md

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+# expand-aliases
+
+**Maintainer:** [Jarmo Pertman](https://github.com/jarmo)
+
+This plugin expands aliases while typing them in terminal.
+
+For example:
+```zsh
+alias foo="bar baz"
+
+$ foo
+# pressing space will expand that alias to... surprise, surprise
+$ bar baz
+```
+
+To **skip** expansion, use `control-space` instead of just `space`.
+
+## Installation
+
+Just add it to `oh-my-zsh` plugins list in `~/.zshrc`, but make sure it is added last (or not
+last if you prefer some aliases not to be expanded).
+
+`
+plugins=(... expand-aliases)
+`

plugins/expand_aliases/expand-aliases.plugin.zsh

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+# Expand aliases when typing
+#
+# Read README.md for setup instructions.
+# 
+# Initially inspired by Gautam Iyer (https://wiki.math.cmu.edu/iki/wiki/tips/20140625-zsh-expand-alias.html)
+
+typeset -a ealiases
+ealiases=(`alias | sed -e 's/=.*//'`)
+
+_expand-ealias() {
+  if [[ $LBUFFER =~ "(^|[;|&])\s*(${(j:|:)ealiases})\$" ]]; then
+    zle _expand_alias
+    zle expand-word
+  fi
+  zle magic-space
+}
+
+zle -N _expand-ealias
+
+bindkey ' '    _expand-ealias
+bindkey '^ '   magic-space          # control-space to bypass completion
+bindkey -M isearch " "  magic-space # normal space during searches